Yesterday I was trying to re-create the sound of a UFO, according to the website of Bob Lazar:

Website of EX-UFO Reverse Engineer guy:
https://boblazar.com/

The website mentions a frequency of 7.46 Hz (Hertz).

So I thought it would be easy to re-create that sound with Delphi and ASIO4ALL v2.14 sound driver and my Laptop L670 and Denon Receiver 1909 and Creative Gigaworks S750 speaker set !

But boy was I in for a surprise !

At 7.46 Hertz the Denon Receiver 1909 would shut down ! and it's power light would start blinking RED.

VERY STRANGE. So yesterday I checked all connections, removed some spider web from back right speaker, removed a little fly. Found my glasses super tiny little screw near central speaker which was funny with my flashlight, never thought I would see it
again. Another backup screw was lost, funny story but oh well. Moved/bend back some copper wire at the back of receiver, it might have been touching a screw (still some air in between) but it was never a problem.

So I basically ruled-out any connection problem, as was mentioned by the denon receiver manual which I also checked, which explained to check connections. It also mentions something about speakers having a wrong inpedeance or something but I don't
understand that part.

Anyway the denon receiver has basically never malfunctioned like this. I can remember hearing some plops on some rare occasions, most on old PC, these might have been some atmospherical/astronomical or loopback issues, but besides from that music always
plays excellent, gaming is excellent, youtube is excellent, rarely any problems.

Only weird thing is if I turn on kitchen power that it stops playing for 1 second as well as laptop I guess.

Anyway today I decided to investigate the problem further and to record it on video because otherwise people are not going to believe. Another reason is because of "Skinwalker Ranch" tv show/youtube/history channel series and they report a strange 2.6
GigaHertz signal every time UFO sightings occur or something strange/whatever.. probably satelitte related. But anyway this was my main reason to investigate "audio signals" and "frequency ranges".

So finding this 7.46 Hertz CRASH was quite spectacular and very strange and alarming.

However the laptop has a defective GPU which has some of it's contacts lost most likely or some kind of defective transistor inside of it so it's unusable for 3D, but the rest seems to work ok. So I kinda doubt it's the GPU at fault. The HDMI also seems
to work ok.

Anyway I did some experiments, I also used a web tone generator, that worked fine. I managed to record my own tone generator a little bit with the recording equipment on this laptop by enabling it. It was strangely very soft volume output which I don't
quite understand, but I enhanced it with goldwave and changed/maximized the volume a couple of time and played it again to see if the wave form would crash the denon receiver it did not !

At first I thought that maybe the negativity of the samples has something to do with it, maybe, but I am not so sure... I don't think it's that... but it's strange.
I tried all negative samples at higher frequencies and then denon does not crash.

Only with below 10 Hertz frequencies does the Denon Receiver "crash"/go into standby mode and only if HDMI is used.

I also tested the analog inputs to the denon receiver by using my older/main PC which I try not to use anymore because of leaky capacitators, it has a Creative Labs X-Fi Elite Pro soundblaster... and there whatever I did, the denon receiver would not
crash.

I also played/changed to different formats for the Denon Receiver on the laptop. Switched from 24 bit, 96000 Hertz to 16 bit, 441000 Hertz, but the crashing remained.

So by ruling out other cases I think I have isolated the problem to the:

ASIO4ALL driver version 2.14 and the usage of HDMI.

So two possibilities now remain:

1. Either it's the ASIO4ALL driver version 2.14 and it has some kind of bug which causes it to crash the Denon Receiver 1909. Perhaps it's outputting some kind of malformed HDMI packets or something.

This could lead to the discovery of some kind of HDMI packet attack against receivers ?

Maybe the Denon Receiver 1909 is detecting the malformed packets and puts itself in standby mode or something to protect itself ?!?

2. Or the Laptop's slightly defective GPU is causing some kind of malformed HDMI packets ?

Basically same conclusion as above Denon Receiver detects it and protects itself from a possible attack ??

Strange clicking/popping can also be heard when the sound starts.

Other possibilities include:

3. Perhaps some bug in Delphi ASIO software package, however it did not show up on the old PC/analog connections, so maybe that is not it.

4. Perhaps bug in my simple software routine, but again I don't think so... because it works fine on old PC.

Some questions:

5. It should be valid to generate double floating point values ranging from 1.0 to -1.0 ?

Or at least 0.99 to -0.99 but even smaller values still crash the denon receiver via asio4all driver at low frequencies.

So I am pretty sure it's not 3 or 4, 5 was also tested and is most likely not it, 1.0 and -1.0 might overflow to 1.00001 and -1.00001 and such but even lower values still crashed it, so this cannot be it.

So as far as I am concerned it leaves some possibilities:

1. Either the ASIO4ALL v2.14 has a serious low frequency bug.

2. The laptop's damaged GPU/HDMI has something to do with it.

3. It could also be some hardware bug in AMD HDMI output device.

(Perhaps some malformed HDMI packet).

1. Anyway, what you can do to rule out or comform the bug in ASIO4ALL version 2.14 is install it on your system.

2. Download my tone generator, which I will make available. Run it and then see if it also crashes your Receiver if you have one.

If it does crash then we could be on to something and then that could mean that Receivers are crasheable somewhat via HDMI packet attacks.

If it doesn't crash with this ASIO4ALL v2.14 driver then it must be this shitty laptop... and then hopefully this issue will disappear when I buy new computer.

Anyway I test a lot of stuff and I have seen plenty of weird/whacky problems, this is one of them.

Oh, I almost forgot, videos to prove this issue is real lol, they are uploading now, fortunately I bought a new fast but hot 256 GB SD card, it's so tiny it's crazy ! Could fit between my teeth ! HAHA. (It goes into a bigger SD card so it fits into my
camera hehe... some day petabeta SD devices will exist I am sure :) as long as they can cool it hehe)

VIDEOS TO PROVE AND INVESTIGATE THE ISSUE:

PART 1: Weird Audio Bug In ASIO4ALL v2.14 with HDMI (?) Part 1 of 4 https://youtu.be/gjnnf_MZmhQ

PART 2: Weird Audio Bug In ASIO4ALL v2.14 (with HDMI) Part 2 of 4 https://youtu.be/aAC8mnlrGvs

PART 3: Weird Audio Bug In ASIO4ALL v2.14 (with HDMI) Part 3 of 4 https://youtu.be/rqVfsobfEr8

PART 4: Weird Audio Bug In ASIO4ALL v2.14 Part 4 of 4 https://youtu.be/pGksplVR8PQ

It's still uploading as I write this. I am going to catch a drink.

If everything goes well these videos will be available in a few minutes to sink your teeth into it ! Quite fascinating to see a Receiver crash/shut down like that... never happened before ! HAHA.

It reminds me of stories of UFO witnesses that say their CARS malfunctioned or all their electronic equipment starting to ACT WEIRD ! ;) =D

Bye for now,
Skybuck.

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Skybuck Flying <skybuckflying@gmail.com> wrote:

At 7.46 Hertz the Denon Receiver 1909 would shut down ! and it's power ligh= >t would start blinking RED.

You bet. It's going into protection to prevent it from blowing itself up. Those speakers can hardly drive 75 Hz, let alone 7.5 Hz. Be glad you have protection logic in your amp instead of a bunch of ruined hardware.

You're trying to drive those speakers more than ten times out of their operating range. You wouldn't expect your car to behave very well if you
tried to drive it at 800 miles an hour instead of 80 either.
--scott

--
"C'est un Nagra. C'est suisse, et tres, tres precis."

--- SoupGate-Win32 v1.05
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On 27/07/2022 15:53, Tobiah wrote:

On 7/27/22 07:11, Scott Dorsey wrote:

Skybuck Flying <skybuckflying@gmail.com> wrote:

At 7.46 Hertz the Denon Receiver 1909 would shut down ! and it's
power ligh=
t would start blinking RED.

You bet. It's going into protection to prevent it from blowing itself
up.
Those speakers can hardly drive 75 Hz, let alone 7.5 Hz. Be glad you
have
protection logic in your amp instead of a bunch of ruined hardware.

You're trying to drive those speakers more than ten times out of their
operating range. You wouldn't expect your car to behave very well if you
tried to drive it at 800 miles an hour instead of 80 either.
--scott

When I first got an FM synth (80's) I experimented with low
frequency sine waves. I was able to play frequencies lower
then 7.5hz without a problem. I could see the woofer of my
rather ordinary speakers dutifully pushing in and out in
accordance with the signal. I never had any problems doing
that.

It seems that your car comparison would play better if
we were talking about the amplitude of the signal.
What is it in an amplifier circuit that is under stress
at 7.5Hz? I could imagine that capacitors would fill up
which I could see causing problems.

Loud signals at low frequencies need a lot of power to be fed into the
speaker, and speaker impedances tend to reduce at low frequencies, as
they are mainly inductive devices as far as the amplifier is concerned.

Add the two together, and it is easy to trip the protection or blow the
fuses. Most commercial amplifiers are designed to reduce the output
levels below about 20 Hz, which avoids the problem.


--
Tciao for Now!

John.

--- SoupGate-Win32 v1.05
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On 7/27/22 07:11, Scott Dorsey wrote:

Skybuck Flying <skybuckflying@gmail.com> wrote:

At 7.46 Hertz the Denon Receiver 1909 would shut down ! and it's power ligh= >> t would start blinking RED.

You bet. It's going into protection to prevent it from blowing itself up. Those speakers can hardly drive 75 Hz, let alone 7.5 Hz. Be glad you have protection logic in your amp instead of a bunch of ruined hardware.

You're trying to drive those speakers more than ten times out of their operating range. You wouldn't expect your car to behave very well if you tried to drive it at 800 miles an hour instead of 80 either.
--scott

When I first got an FM synth (80's) I experimented with low
frequency sine waves. I was able to play frequencies lower
then 7.5hz without a problem. I could see the woofer of my
rather ordinary speakers dutifully pushing in and out in
accordance with the signal. I never had any problems doing
that.

It seems that your car comparison would play better if
we were talking about the amplitude of the signal.
What is it in an amplifier circuit that is under stress
at 7.5Hz? I could imagine that capacitors would fill up
which I could see causing problems.


Tobiah

--- SoupGate-Win32 v1.05
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In article <tbrjhj$1hni$1@gioia.aioe.org>, Tobiah <toby@tobiah.org> wrote: >When I first got an FM synth (80's) I experimented with low

frequency sine waves. I was able to play frequencies lower
then 7.5hz without a problem. I could see the woofer of my
rather ordinary speakers dutifully pushing in and out in
accordance with the signal. I never had any problems doing
that.

First of all, measure the DC resistance of your speakers. An eight ohm
speaker is likely around 2 to 3 ohms resistance, and at 7.5 Hz you are
pretty close to DC. Your amp won't like driving much power into that load.
And what is worse, most of the energy is going into resistive losses in
the voice coil, which will get pretty hot.

You can see the cones moving in and out, but you won't actually move very
much air either.

It seems that your car comparison would play better if
we were talking about the amplitude of the signal.
What is it in an amplifier circuit that is under stress
at 7.5Hz? I could imagine that capacitors would fill up
which I could see causing problems.

The amplifier is under stress because it's got a very low impedance load
on the output. It might be fine putting out a couple watts, but it will
go into protection if you try and put much power out. Unless it's an amp designed for very low-Z loads in which case the speaker will vaporize long before the amp.
--scott

--
"C'est un Nagra. C'est suisse, et tres, tres precis."

--- SoupGate-Win32 v1.05
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Scott Dorsey wrote:
================

Skybuck Flying

At 7.46 Hertz the Denon Receiver 1909 would shut down ! and it's power ligh= >t would start blinking RED.

You bet. It's going into protection to prevent it from blowing itself up.

** Nearly all stereo amps and receivers from Asia have switch on delay, plus DC offset & low frequency protection.
This usually consists of one or more a speaker relays driven by a special IC that monitors the output from each channel and will hold the relay/s open if a fault condition is sensed.
The switch on delay is for "anti thump" and there is also a fast fast off when AC power is removed for the same reason.

IME, low frequency detection operates from about 5 to 10 Hz downwards at level of about 10V peak at the output.
This is mainly to save woofers from damage due to over excursion, plus it sounds horrible.
How do these high level sub sonics ever arise in normal use?
From rough handing of a turntable with the volume advanced.

FYI 1
the standard test of such protection schemes is to feed in a sine wave of about 5Hz from a bench generator with NO load connected.
The relays typically react by cycling on and off ( ie clicking audibly ) or locking out until the test signal is removed.

FYI 2

" Skybuck Flying" does not inhabit the same planet as you and I.


..... Phil

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palli...@gmail.com <pallison49@gmail.com> wrote:

Scott Dorsey wrote:
================

Skybuck Flying

At 7.46 Hertz the Denon Receiver 1909 would shut down ! and it's power ligh=
t would start blinking RED.

You bet. It's going into protection to prevent it from blowing itself up.

** Nearly all stereo amps and receivers from Asia have switch on delay,
plus DC offset & low frequency protection.
This usually consists of one or more a speaker relays driven by a special
IC that monitors the output from each channel and will hold the relay/s
open if a fault condition is sensed.
The switch on delay is for "anti thump" and there is also a fast fast off when AC power is removed for the same reason.

IME, low frequency detection operates from about 5 to 10 Hz downwards at level of about 10V peak at the output.
This is mainly to save woofers from damage due to over excursion, plus it sounds horrible.
How do these high level sub sonics ever arise in normal use?
From rough handing of a turntable with the volume advanced.

FYI 1
the standard test of such protection schemes is to feed in a sine wave of about 5Hz from a bench generator with NO load connected.
The relays typically react by cycling on and off ( ie clicking audibly )
or locking out until the test signal is removed.

FYI 2

" Skybuck Flying" does not inhabit the same planet as you and I.

..... Phil

Not to mention he probably couldn’t hear anything, so turned up the volume.

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